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UNITED STATES PATENT OFFICE.

JOHN A. MOORE, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO GEORGE W. MOORE, OF SAME PLACE.

GRiND ING-MILL.

SPECIFICATION forming part of Letters Patent No. 244,363, dated July 12, 1881.

Application filed March 17, 1881. (No model.)

To an whom it may concern Be it known that I, JOHN A. MOORE, of Providence, in the State of Rhode Island, have invented an Improvement in Grinding- Mills, of which the following is a specification.

My invention relates to certain improvements in that class of grinding-mills which operate by percussion 5 and it consists in an improved reversible beater adapted for attachment to beater-arms arranged to move edgewise, and also made reversible.

It also consists in an improved reversible bar forforming the liningof thecylinder. Grindingmills of this class owe their efficiency to the extremely-rapid motion of the heaters, which,by striking the particles of the material to be acted upon, throw them with great force against the inclined sides of thelining of the cylindrical case, from which they will rebound and be repeatedly brought within the action of the beaters. In pulverizing hard substances like minerals or ores the acting parts of the mill are subject to very rapid wear, and it is the object of my improvement to increase the durability of such machines by making the sev-. eral rapidly-wearing parts capable of being reversed whenever one of their sides or operating-faces has become worn out, thus increasing the durability of the machine twofold.

Figure 1 represents an end elevation of the mill, with a portion of the end broken away to show the stationary reversible lining and the revolving beaters. Fig. 2 represents a side elevation, with a portion of the cylinder broken away to show the interior parts. Fig. 3 represents a perspective view of the reversible-lining bar. Fig. 4 represents a perspec tive view of one of the heaters.

In the accompanying drawings, A A represent a cylindrical case, made in two parts, the upper section, A, being removable for the purpose of inspection and repairs, the lower section, A, being secured to the base-pieces B B for firm attachment to the floor or foundation.

O is the hopper or inlet-opening at the end of the lower section, through which the material tobe acted upon enters the case A A, to

be subjected to the action'of the revolving heaters D D. p

E is the pipe through which the finely-pulverized material escapes from the mill.

F is the shaft, having upon its opposite ends the driving-pulleys G G.

H H are disks, provided on one side with a 5 hub, h, for secure attachment to the shaft F, and on the opposite side with the flat grooves II, crossing the plain face of the disk at right angles to each other.

The arms J J are made of flat steel bars, iit- 6o ting within the grooves I I, and secured to the disk H by means of bolts 7: 'i, and extend from the shaft F outward to a point near the inner circumference of the cylindrical case.

Upon the outer end of each of the steel arms J J are attached the boaters D, cast with a shank, d, arranged transversely of the beater D, for the purpose of secure attachment to the fiatside of the arms J bymeansof the boltsj j.

At the inner side of each end of the case are attached the lining-segments K, which serve to both protect the ends of the case from abrasion by the swiftly-revolvin g material and to form a groove, 75, between the outer edge of the segment and the inner circumference of the case for the reception of the holding-ears l l of the reversible bar L, provided upon both of its sides with the oppositely-beveled surfaces m m, which, when the ears I l of the several bars are passed within the grooves k at each end of the mill, serve to form the grooved percussion-lining of the inclosing-cylinder.

Thev bars L maybe either cast singly, as shown in Fig. 3, or joined together side by side, in pairs, as preferred.

Several sets of heaters are attached to the shaft F within the case, and the arms J J of the several sets are preferably set out of line with each other, in order that the revolving current of air caused by the rapid rotation of 0 the heaters may be made to have both pro gressive and lateral movements, thus thoroughly and evenly distributing the material to be pulverized and bringing it invariably within the range of the several boaters. 5

The grooved lining formed by thebars L serves to prevent the too rapid movement of the current of air, and the steel arms J J, be

in g made to move edgewise, ofi'er the least practicable resistance to the rapid revolution-of 5 the shaft F.

I claim as my im'ention-- 1. In a grinding-mill operating by percussion, the combination of the reversible beaters D with the reversible arms J and grooved :0 disk H, substantially as described.

2. In combination with a series of rotary beaters, a lining composed of bars L, placed transversely, such bars being provided 011 both sides with a flat face and inclined sides m, and having also a tongue, I, substantially as de I 5 scribed.

JOHN A. MOORE. I Witnesses:

H. S. BABCOOK, H. W. HUBBARD. 

